Liquid crystal display device

ABSTRACT

Provided is a liquid crystal display device. The liquid crystal display device includes a first sub-pixel configured to represent any one of red, green, and blue; a second sub-pixel adjacent to the first sub-pixel and configured to represent a different color from the first sub-pixel; and a black matrix disposed underneath along a boundary between the first sub-pixel and the second sub-pixel and configured to have a particular width that suppresses color mixture between the first sub-pixel and the second sub-pixel.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority of Korean Patent Application No.10-2015-0090675 filed on Jun. 25, 2015, the disclosure of which isincorporated herein by reference in its entirety.

BACKGROUND

Field

The present disclosure relates to a liquid crystal display device and astructure thereof.

Description of the Related Art

A liquid crystal display device has a high contrast ratio and issuitable to display a moving image. Further, since power consumption ofthe liquid crystal display device is low, the liquid crystal displaydevice is utilized in various fields such as a notebook computer, amonitor, or a TV. A molecular structure of a liquid crystal is thin andlong. The liquid crystal has an optical anisotropy having a directivityof an orientation and a polarization property by which when the liquidcrystal is located in an electric field, an orientation of the moleculeschanges depending on an intensity of the electric field. Therefore, theliquid crystal display device implements an image using the opticalanisotropy and the polarization property of the liquid crystal.

Generally, a liquid crystal display device includes a liquid crystalpanel in which a liquid crystal layer is interposed between two opposingsubstrates to bond the substrates to each other. Electrodes are formedon inner surfaces of two substrates to change an orientation of theliquid crystal molecules by an electric field applied to the twoelectrodes, thereby causing difference of light transmittances.

The transmittance difference of the liquid crystal panel, light suppliedfrom a backlight which is disposed on a rear surface of the liquidcrystal panel passes through the liquid crystal panel. Color compositionwhich is implemented while the light supplied from the backlight passesthrough a color filter is reflected to display a color image.

A general manufacturing process of a liquid crystal display device maybe divided into a substrate manufacturing process which forms an arraysubstrate and a color filter substrate, a cell process which completes aliquid crystal panel, and a module process which integrates the liquidcrystal panel and the backlight.

Among the above processes, during the substrate manufacturing process,thin film deposition, photolithography, and etching processes arerepeated several times to implement a thin film transistor (TFT) arraylayer and the color filter layer on each substrate. During the cellprocess, a seal pattern is formed to be bond onto any one of the TFTarray substrate and the color filter substrate, and then two substratesare bonded to be opposite to each other with a liquid crystal layertherebetween, thereby completing the liquid crystal panel. During themodule process, a polarizer and a driving circuit are attached onto theliquid crystal panel completed as described above and then the liquidcrystal panel is integrated with the backlight to form a liquid crystaldisplay device.

In the meantime, a spacer is provided between the TFT array substrateand the color filter substrate to constantly maintain an intervalbetween the two substrates. The spacer is classified into a ball spacerand a column spacer in accordance with a shape and a disposing method.The ball spacer is formed to be scattered on the array substrate or thecolor filter substrate and the column space is formed on the colorfilter substrate through patterning. Recently, a column spacer which isformed in a specific position with a desired shape is widely used.

SUMMARY

An object of the present disclosure is to provide a liquid crystaldisplay device. More specifically, an object of the present disclosureis to provide a liquid crystal display device having a structure whichsuppresses color mixture between adjacent pixels.

Objects according to an exemplary embodiment of the present disclosureare not limited to the above-mentioned objects, and other objects, whichare not mentioned above, can be clearly understood by those skilled inthe art from the following descriptions.

According to an aspect of the present disclosure, there is provided aliquid crystal display device. The liquid crystal display deviceincludes: a first sub-pixel configured to represent any one of red,green, and blue; a second sub-pixel adjacent to the first sub-pixel andconfigured to represent a different color from the first sub-pixel and ablack matrix disposed underneath along a boundary between the firstsub-pixel and the second sub-pixel and configured to have a particularwidth that suppresses color mixture between the first sub-pixel and thesecond sub-pixel.

According to another aspect of the present disclosure, there is provideda TFT array substrate.

The thin film transistor (TFT) array substrate includes: a supportingsubstrate; display elements disposed on the supporting substrate andprovided to display an image; a planarization layer that flattens upperportions of the display elements; and a black matrix on theplanarization layer and underneath along a boundary between two adjacentsub-pixels.

According to an exemplary embodiment of the present disclosure, colormixture between adjacent pixels may be efficiently suppressed.Specifically, in a liquid crystal display device according to anexemplary embodiment of the present disclosure, a width of the blackmatrix is reduced, so that transmittance may be improved as comparedwith a display device of the related art. Further, an integratedstructure of the black matrix and the column spacer according to anexemplary embodiment of the present disclosure may contribute tosimplify a process and save a manufacturing cost.

The objects to be achieved by the present disclosure, the means forachieving the objects, and effects of the present disclosure describedabove do not specify essential features of the claims, and, thus, thescope of the claims is not limited to the disclosure of the presentdisclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features and other advantages of thepresent disclosure will be more clearly understood from the followingdetailed description taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 is a schematic plane view of a liquid crystal display device;

FIG. 2 is a schematic cross-sectional view of a liquid crystal displaydevice;

FIG. 3 is a view explaining a color mixture phenomenon which isgenerated in a liquid crystal display device;

FIG. 4 is a view explaining a structure of a black matrix according toan exemplary embodiment of the present disclosure; and

FIGS. 5A to 5C are plane views and cross-sectional views illustrating aliquid crystal display device according to an exemplary embodiment ofthe present disclosure.

DETAILED DESCRIPTION OF THE PRESENT EMBODIMENT

Advantages and features of the present disclosure, and methods foraccomplishing the same will be more clearly understood from exemplaryembodiments described below with reference to the accompanying drawings.However, the present disclosure is not limited to the followingexemplary embodiments but may be implemented in various different forms.The exemplary embodiments are provided only to complete disclosure ofthe present disclosure and to fully provide a person having ordinaryskill in the art to which the present disclosure pertains with thecategory of the disclosure, and the present disclosure will be definedby the appended claims.

The shapes, sizes, ratios, angles, numbers, and the like illustrated inthe accompanying drawings for describing the exemplary embodiments ofthe present disclosure are merely examples, and the present disclosureis not limited thereto. Like reference numerals generally denote likeelements throughout the present specification. Further, in the followingdescription, a detailed explanation of known related technologies may beomitted to avoid unnecessarily obscuring the subject matter of thepresent disclosure.

The terms such as “including,” “having,” and “consist of” used hereinare generally intended to allow other components to be added unless theterms are used with the term “only”. Any references to singular mayinclude plural unless expressly stated otherwise.

Components are interpreted to include an ordinary error range even ifnot expressly stated.

When the position relation between two parts is described using theterms such as “on”, “above”, “below”, and “next”, one or more parts maybe positioned between the two parts unless the terms are used with theterm “immediately” or “directly”.

When the relation of a time sequential order is described using theterms such as “after”, “continuously to”, “next to”, and “before”, theorder may not be continuous unless the terms are used with the term“immediately” or “directly”.

Although the terms “first”, “second”, and the like are used fordescribing various components, these components are not confined bythese terms. These terms are merely used for distinguishing onecomponent from the other components. Therefore, a first component to bementioned below may be a second component in a technical concept of thepresent disclosure.

The features of various embodiments of the present disclosure can bepartially or entirely bonded to or combined with each other and can beinterlocked and operated in technically various ways, and theembodiments can be carried out independently of or in association witheach other.

Hereinafter, various exemplary embodiments of the present disclosurewill be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic plane view of a liquid crystal display device andFIG. 2 is a schematic cross-sectional view of a liquid crystal displaydevice.

The liquid crystal display device 100 includes a first substrate (TFTarray substrate) 110, a second substrate (color filter substrate) 115, athin film transistor (TFT) 130, planarization layers 122 and 123, acommon electrode 140, a pixel electrode 150, a column spacer 160, and ablack matrix 180. For the convenience of description, only some ofcomponents of the liquid crystal display device 100 are illustrated inFIG. 1.

The first substrate 110 is an array substrate of the liquid crystaldisplay device 100 and includes a plurality of pixels (pixels orsub-pixels) and a pixel driving element (a transistor, a capacitor, orthe like). A pixel region may be defined as an area generated when agate line GL and a data line DL intersect each other. In the liquidcrystal display device 100, N gate lines GL and M data lines intersectto form M×N (sub) pixels. However, for the convenience of description,only two red sub-pixels R, two green sub-pixels G, and two bluesub-pixels B are illustrated in FIG. 1. The pixels of FIG. 1 are definedin the order of green sub-pixels G, green sub-pixels B, and redsub-pixels R on a plane.

The thin film transistor 130 is formed on the first substrate 110. Thethin film transistor 130 is disposed corresponding to each sub-pixel R,G, or B. Each thin film transistor 130 includes a gate electrode 131, anactive layer 132, a source electrode 133, and a drain electrode 134which are formed on the first substrate 110. Specifically, the gateelectrode 131 which is electrically connected to the gate line GL isformed on the first substrate 110. A gate insulating layer 121 is formedon the gate electrode 131. Further, the active layer 132 on which achannel is formed is formed on the gate insulating layer 121. The drainelectrode 134 which is electrically connected to the data line DL andthe source electrode 133 which is electrically connected to the pixelelectrode 150 are formed on the active layer 132. The active layer 132may be formed of amorphous silicon, polycrystalline silicon, or an oxidesemiconductor.

A first planarization layer 122 is formed to cover the thin filmtransistor 130 on the first substrate 110. The first planarization layer122 flattens an upper portion of the first substrate 110 on which thethin film transistor 130 is formed. The first planarization layer 122may be formed of an organic insulating material having a lowpermittivity, such as photo-acryl (PAC), or the like. Even though notillustrated in FIG. 2, a separate insulating layer (passivation layer)may be formed on the thin film transistor 130 and the firstplanarization layer 122 may be formed on the insulating layer.

The common electrode 140 is formed on the first planarization layer 122.The common electrode 140 is an electrode to drive a liquid crystal layer(not illustrated). The common electrode 140 is formed in a regionexcepting a region where a contact hole is formed to electricallyconnect the pixel electrode 150 to the source electrode 133 of the thinfilm transistor 130, by a single pattern. Even though not illustrated inFIGS. 1 and 2, the common electrode 140 may be electrically connected toa common line which is disposed to be parallel to the gate line GLthrough a separate contact hole.

A second planarization layer 123 is formed on the common electrode 140.The second planarization layer 123 protects the common electrode 140 andflattens an upper portion of the common electrode 140. The secondplanarization layer 123 may be formed of the same material as the firstplanarization layer 122 or may be formed of an insulating materialdifferent from the first planarization layer 122.

The pixel electrode 150 is formed on the second planarization layer 123.The pixel electrode 150 is an electrode to drive the liquid crystallayer and is formed in each pixel with a box shape. Further, the pixelelectrode 150 is formed on the second planarization layer 123 to have aplurality of slits. The pixel electrode 150 is electrically connected tothe source electrode 133 of the thin film transistor 130 through thecontact hole which is formed in the first planarization layer 122 andthe second planarization layer 123. As illustrated in FIG. 1, the pixelelectrode 150 may be formed such that a center part is bent at leastonce. The pixel electrode 150 and the common electrode 140 may be formedof a transparent conductive material.

In FIG. 1, it is illustrated that the pixel electrode 150 is formed witha box shape and has a plurality of slits and the common electrode 140 isformed by a single pattern. However, instead of the pixel electrode 150,the common electrode 140 may be formed to have a plurality of slits.Differently from FIG. 2, the common electrode 140 may be formed abovethe pixel electrode 150 or the pixel electrode 150 and the commonelectrode 140 may be disposed on the same layer.

The second substrate 115 is a color filter substrate of the liquidcrystal display device 100 and is formed to be opposite to the firstsubstrate 110. In the second substrate 115, the black matrix 180 whichdefines the (sub) pixel as a light shielding area and an aperture area.The black matrix 180 corresponds to a boundary of the pixel area andsuppresses light leakage. The black matrix 180 is formed of an opaquematerial. That is, a region where the black matrix 180 is formed isdefined as a light shielding area and a region where the black matrix180 is not formed is defined as an aperture area. In the areacorresponding to the light shielding area, various driving elements andwiring lines such as the thin film transistor 130, the data line DL, andthe gate line GL are formed. In the area defined as the aperture area,the pixel electrode 150 and the common electrode 140 are formed.

On the second substrate 115 on which the black matrix 180 is formed, aplurality of color filters 190 is formed. Specifically, a red colorfilter 191, a green color filter 192, and a blue color filter 193 areformed to correspond to aperture areas of the red sub-pixel R, the greensub-pixel G, and the blue sub-pixel B, respectively. Some areas of thered color filter 191, the green color filter 192, and the blue colorfilter 192 may overlap the black matrix 180.

An overcoating layer 124 is formed on the second substrate 115 to coverthe black matrix 180, the red color filter 191, the green color filter192, and the blue color filter 193. The overcoating layer 124 is a layerto flatten a lower part of the second substrate 115 on which the blackmatrix 180, the red color filter 191, the green color filter 192, andthe blue color filter 193 are formed. The overcoating layer 124 isformed of an insulating material. The overcoating layer 124 may beformed of the same material as the first planarization layer 122.

The column spacer 160 is formed between the first substrate 110 and thesecond substrate 115. The column spacer 160 maintains a cell gap of theliquid crystal display device 100. The column spacer 160 is formed inthe light shielding area where the black matrix 180 is formed.

As illustrated in FIG. 2, the column spacer 160 is disposed tocorrespond to the light shielding area between the blue sub-pixel B andthe red sub-pixel R. That is, the column spacer 160 is formed to overlapthe data line DL formed in the light shielding area between the bluesub-pixel B and the red sub-pixel R and also overlap the black matrix180.

In FIGS. 1 and 2, even though it is illustrated that the column spacer160 is formed between the red sub-pixel R and the blue sub-pixel B, thecolumn spacer is not limited thereto. The column spacer 160 may beformed between the red sub-pixel R and the green sub-pixel G or betweenthe green sub-pixel G and the blue sub-pixel B.

A first alignment layer is formed on the second planarization layer 123of the first substrate 110 and a second alignment layer may be formed onthe overcoating layer 124 of the second substrate 115. The firstalignment layer and the second alignment layer may be formed ofpolyimide (PI).

The liquid crystal layer may be interposed between the first substrate110 and the second substrate 115. The liquid crystal layer is interposedbetween the second planarization layer 123 of the first substrate 110and the overcoating layer 124 of the second substrate 115. Specifically,the liquid crystal layer may be interposed between the first alignmentlayer and the second alignment layer.

A backlight unit 170 which supplies light onto the liquid crystal layerof the liquid crystal display device 100 may be further provided.

FIG. 3 is a view explaining a color mixture phenomenon which isgenerated in a liquid crystal display device.

In the liquid crystal display device illustrated in FIGS. 1 and 2, thecolor filters 191 and 193 and the black matrix 180 is disposed on anupper substrate. According to this structure, color mixture phenomenonmay occur between adjacent pixels which represent different colors.

Referring to FIG. 3, a white light is incident onto each sub-pixel froma light source (for example, the backlight unit 170) in the liquidcrystal display device. A transmittance amount of the incident light isadjusted in accordance with a state of liquid crystal corresponding toeach sub-pixel to be directed to the color filter. In this case, anelectric field at an edge of each sub-pixel is interfered or distorteddue to an electric field of adjacent pixels, which may change atraveling direction (an optical path) of the incident light. Light Lwhose path is changed is directed to the color filter of neighboringsub-pixels. When the black matrix 180 does not block the light,unintentional color may be represented. Such a phenomenon is alsoreferred to as washout.

The color mixture phenomenon is frequently generated between a turned-onpixel 193 and a turned-off pixel 191. In other words, some of lightincident onto the turned-on pixel 193 from the light source 170 isemitted through the turned-off pixel 191 to cause color mixturephenomenon. In this case, when the width of the black matrix 180 isincreased (for example, 8 μm or larger), the color mixture phenomenonmay be avoided. However, the aperture ratio may be lowered due to theincreased width, so that it is difficult to apply a display device whichhas a high resolution and a high degree of integration.

FIG. 4 is a view explaining a structure of a black matrix according toan exemplary embodiment of the present disclosure.

The structure of the black matrix is a structure for reducing the colormixture phenomenon described with reference to FIG. 3. The structure ofthe black matrix is characterized in that the black matrix 180 islocated to be lower than that of the structure of FIG. 3. With thisstructure, the light L whose path is changed in the vicinity of theboundary between sub-pixels may be very effectively blocked. That is,the black matrix is located to be closer to an area which causes theoptical path to be changed, so that the light which causes the colormixture is initially blocked.

In order to implement the above-described structure, the black matrix180 may be located on the top of the TFT array substrate. When the cellgap is considered, the top of the TFT array substrate is a positionwhich is the closest to the area which causes the optical path to bechanged. If the black matrix is disposed on the color filter substrate,the black matrix may not be located to be closer to the area than theblack matrix which is located on the TFT array substrate. Animplementation example in which the black matrix is located on the TFTarray substrate will be described in detail with reference to FIGS. 5Ato 5C.

FIGS. 5A to 5C are plane views and cross-sectional views illustrating aliquid crystal display device according to an exemplary embodiment ofthe present disclosure.

Components of FIGS. 5A to 5C denoted by the same reference numerals asthose in FIG. 2 are substantially same components, so that redundantdescription will be omitted.

The liquid crystal display device includes a color filter substrate, athin film transistor (TFT) array substrate, and a liquid crystal layerbetween the two substrates. The color filter substrate includes a firstsub-pixel which is provided to represent any one of red, green, andblue, a second sub-pixel which is adjacent to the first sub-pixel and isprovided to represent a different color from that of the firstsub-pixel, and a black matrix 180 which is provided between the firstsub-pixel and the second sub-pixel and suppresses color mixture betweenthe first sub-pixel and the second sub-pixel. In this case, the firstsub-pixel and the second sub-pixel are a predetermined unit area whichis defined on a plane of the display device and collectively refer toelements (a circuit, a color filter, or the like) involved to representone color. The display device of FIGS. 5A to 5C may further includepassivation layers PAS1 and PAS2 which serve as insulating layers onelectric elements.

The black matrix 180 is included in the TFT array substrate. Accordingto an exemplary embodiment, as illustrated in FIG. 5B, the black matrix180 may be located above a transistor 130 involved to drive the firstsub-pixel or the second sub-pixel. Therefore, it is possible toeffectively block the light L whose path is changed in the vicinity of aboundary between sub-pixels, as illustrated in FIG. 4. Morespecifically, the black matrix 180 is located on the planarization layer123. The planarization layer 123 is located above the transistor whichis involved to drive the first sub-pixel or the second sub-pixel, on theTFT array substrate. The planarization layer 123 flattens a layer onwhich the electrode 140 or 150 involved to drive the first sub-pixel orthe second sub-pixel is disposed. The planarization layer 123 may be anovercoating layer which flattens an upper portion of the electrode or apassivation layer.

Among light incident onto any one sub-pixel between the first sub-pixeland the second sub-pixel, the black matrix 180 may serve to block lightleaked through any one sub-pixel. The black matrix 180 may block lightleakage illustrated in FIG. 4, for example, light leakage (or colormixture) which is caused when any one of the first sub-pixel and thesecond sub-pixel is turned on and the other one is turned off. Asdescribed above, the black matrix 180 may block the leaked light when itis closer to a position where the light is leaked. Therefore, eventhough the black matrix 180 has a smaller width as compared to a casewhen the black matrix is disposed on the color filter substrate, thesame effect may be achieved. Accordingly, the black matrix 180 may havea width which is determined based on an angle at which light, which isincident onto the turned-on sub-pixel in a first direction (for example,a vertical direction), travels in a different direction from the firstdirection at the boundary between the turned-on sub-pixel and theturned-off sub-pixel. For example, the black matrix 180 may have a widthwhich may meet an extension line of light which is twisted at the mostinner side, in the area (A in FIG. 4) where the traveling direction ofthe incident light is twisted.

In the meantime, the black matrix 180 is located on the top of the TFTarray substrate, so that an additional function/structure may be furtherprovided. That is, the black matrix 180 may further include a structure181 to secure (maintain) an interval (cell gap) between the TFT arraysubstrate and the color filter substrate. The structure 181 may be addedon the black matrix 180 with a tapered shape, like the column space 160of FIG. 2.

The structure 181 may be provided in a part of the black matrix 180, forexample, in a part corresponding to a region where a data line extendingin a DL direction intersects a gate line extending in a GL direction.Referring to FIG. 5A, it is known that a structure serving as a spaceris disposed in the vicinity of a position where the data line and thegate line intersect each other, as illustrated in FIG. 1.

The structure 181 may be formed of the same material as the black matrix180. That is, the structure 181 may be formed of an opaque material,like the black matrix. Therefore, the structure 181 may be manufacturedby a process (for example, a deposition process) for forming the blackmatrix on the TFT substrate. For example, when a black matrix pattern isdeposited on the substrate, a specific area is formed to be thicker thanthe other area to manufacture the structure 181. When a multi tone mask(MTM) or a half tone mask (HTM) manner described above is used, theblack matrix 180 and the spacer structure 181 may be manufactured by asingle process using one mask. According to the structure of FIGS. 1 and2, the black matrix is primarily patterned on the color filter substrateand then the column spacer 160 is secondarily patterned on theplanarization layer 124. Therefore, two separate processes using twomasks are required. In contrast, the black matrix 180 and the spacerstructure 181 suggested in the present disclosure may be manufactured byan effective manufacturing process with a reduced number of masks and areduced number of processes.

A position where the black matrix 180 and the spacer structure 181suggested in the present disclosure are located on the TFT arraysubstrate will be described in more detail. The TFT array substrateincludes a supporting substrate (e.g., base layer) 110 and displayelements 130, 140, and 150 which are disposed on the supportingsubstrate and is involved to display an image.

The black matrix 180 may be located on the top of the TFT arraysubstrate, as illustrated in FIG. 5B (a cross-sectional view taken alongthe line b-b′ of FIG. 5A) or FIG. 5C (a cross-sectional view taken alongthe line c-c′ of FIG. 5A). For example, the black matrix 180 may belocated on the planarization layer 124 which is disposed above thedisplay element. In this case, the black matrix 180 is located in anarea which divides the sub-pixels. The planarization layer 124 flattensupper portions of the display elements (driving elements) such as thetransistor, the pixel electrode, and the common electrode. The pixelelectrode and the common electrode may be located on the same layer andlocated on different layers. The planarization layer 124 refers to alayer which flattens an upper portion of an electrode which is locatedabove the planarization layer. Among light which are incident onto anyone sub-pixel from the light source 170, the black matrix 180 isprovided to block light leaked through adjacent sub-pixel. A principleof blocking light which is leaked to the adjacent pixel is as describedwith reference to FIG. 4.

The spacer structure 181 is located on the black matrix 180. In thiscase, the spacer structure 181 may be also referred to as a columnspacer. The spacer structure 181 may be patterned in a partial area ofthe black matrix 180. The spacer structure 181 serves to maintain a cellgap. The position of the spacer structure 181 may be determined invarious positions. As one example, as illustrated in FIGS. 5A and 5C,the spacer structure 181 may be located in a region where the data lineDL and the gate line are intersecting each other. Further, a height ofthe spacer structure 181 may be determined by a required cell gap.

The structure 181 may be formed of the same material as the blackmatrix. In this case, the spacer structure 181 may be manufactured bythe same process as the black matrix 180 using a half tone mask.

As described above, according to an exemplary embodiment of the presentdisclosure, when the planarization layer is formed using a mask havingat least one semi-transparent area corresponding to the pad area, a timefor an ashing process to remove the planarization layer on the pad areais shortened. Therefore, a size of the first contact hole in the displayarea is suppressed from being significantly increased. Further, duringan etching process of forming the first contact hole, the planarizationlayer in the pad area may reduce damage of an insulating layer in thepad area or a pad electrode. Therefore, a driving problem of the displaydevice caused thereby may be reduced.

The exemplary embodiments of the present disclosure can also bedescribed as follows:

According to an aspect of the present disclosure, a liquid crystaldisplay device includes: a first sub-pixel configured to represent anyone of red, green, and blue; a second sub-pixel adjacent to the firstsub-pixel and configured to represent a different color from the firstsub-pixel; and a black matrix disposed underneath along a boundarybetween the first sub-pixel and the second sub-pixel and configured tohave a particular width that suppresses color mixture between the firstsub-pixel and the second sub-pixel.

The black matrix is configured to block light leaked through one of thefirst sub-pixel and the second sub-pixel among light which are incidentonto the other of the first sub-pixel and the second sub-pixel.

The black matrix may block the leaked light when any one of the firstsub-pixel and the second sub-pixel is turned on and the other one isturned off.

The black matrix may have a width determined based on an angle toproceed differently to a first direction, which is incident onto aturned-on sub-pixel in a first direction, at a boundary between theturned-on sub-pixel and the turned-off sub-pixel.

The black matrix may be on a transistor which is involved to drive thefirst sub-pixel or the second sub-pixel, on the TFT array substrate.

The black matrix may be on a planarization layer that flattens a layerincluding an electrode configured to drive the first sub-pixel or thesecond sub-pixel on the TFT array substrate, and the planarization layeris on the transistor configured to drive the first sub-pixel and thesecond sub-pixel.

The planarization layer may be an overcoating layer which flattens anupper portion of the electrode.

In a partial area of the black matrix, wherein the structure isconfigured to secures an interval between the TFT array substrate and acolor filter substrate may be further provided.

The structure may be disposed in a position corresponding to a regionwhere a data line and a gate line intersect each other.

The structure may be formed of the same material as the black matrix bya process of forming the black matrix on the TFT substrate.

According to an aspect of the present disclosure, a thin film transistor(TFT) array substrate, includes: a supporting substrate; displayelements disposed on the supporting substrate and provided to display animage; a planarization layer that flattens upper portions of the displayelements; and a black matrix on the planarization layer and underneathalong a boundary between two adjacent sub-pixels.

The black matrix may be configured to block light leaked through theother adjacent among light which are incident onto any one of sub-pixelsfrom a light source.

The display element may include a thin film transistor, a pixelelectrode, and a common electrode and the planarization layer mayflatten an upper portion of an electrode which is disposed to be higherthan the other, between the pixel electrode and the common electrode.

In a partial area of the black matrix, a column spacer for maintain acell gap may be further provided.

The black matrix and the column spacer may be manufactured by the sameprocess using a half tone mask.

Although the exemplary embodiments of the present disclosure have beendescribed in detail with reference to the accompanying drawings, thepresent disclosure is not limited thereto and may be embodied in manydifferent forms without departing from the technical concept of thepresent disclosure. Therefore, the exemplary embodiments of the presentdisclosure are provided for illustrative purposes only but not intendedto limit the technical concept of the present disclosure. The scope ofthe technical concept of the present disclosure is not limited thereto.Therefore, it should be understood that the above-described exemplaryembodiments are illustrative in all aspects and do not limit the presentdisclosure. The protective scope of the present disclosure should beconstrued based on the following claims, and all the technical conceptsin the equivalent scope thereof should be construed as falling withinthe scope of the present disclosure.

What is claimed is:
 1. A liquid crystal display device, comprising: afirst sub-pixel representing one of red, green, and blue; a secondsub-pixel adjacent to the first sub-pixel and representing a colordifferent from the first sub-pixel; and a black matrix underneath alonga boundary between the first sub-pixel and the second sub-pixel andconfigured to have a particular width that suppresses color mixturebetween the first sub-pixel and the second sub-pixel.
 2. The liquidcrystal display device according to claim 1, wherein the black matrix isconfigured to block a portion of light leaked through one of the firstsub-pixel and the second sub-pixel from the light incident onto theother of the first sub-pixel and the second sub-pixel.
 3. The liquidcrystal display device according to claim 2, wherein the black matrixblocks the leaked light when one of the first sub-pixel and the secondsub-pixel is turned on and the other one is turned off.
 4. The liquidcrystal display device according to claim 3, wherein the black matrixhas a width determined based on an angle to proceed differently in afirst direction, which is incident onto a turned on sub-pixel in thefirst direction, travels in a different direction from the firstdirection, at a boundary between the turned on sub-pixel and the turnedoff sub-pixel.
 5. The liquid crystal display device according to claim2, wherein the black matrix is on a transistor which is configured todrive the first sub-pixel or the second sub-pixel, on a thin-filmtransistor (TFT) array substrate.
 6. The liquid crystal display deviceaccording to claim 5, wherein the black matrix is on a planarizationlayer that flattens a layer including an electrode configured to drivethe first sub-pixel or the second sub-pixel on the TFT array substrate,and the planarization layer is on the transistor configured to drive thefirst sub-pixel and the second sub-pixel.
 7. The liquid crystal displaydevice according to claim 6, wherein the planarization layer is anovercoating layer to flatten an upper portion of the electrode.
 8. Theliquid crystal display device according to claim 1, further comprising astructure in a partial area of the black matrix, wherein the structureis configured to secure a gap between a thin-film transistor (TFT) arraysubstrate and a color filter substrate is further provided.
 9. Theliquid crystal display device according to claim 7, wherein thestructure is disposed in a position corresponding to a region where adata line intersect with a gate line.
 10. The liquid crystal displaydevice according to claim 7, wherein the structure is formed of a samematerial as the black matrix by a process of forming the black matrix onthe TFT substrate.
 11. A thin film transistor (TFT) array substrate,comprising: a supporting substrate; display elements disposed on thesupporting substrate and provided to display an image; a planarizationlayer that flattens upper portions of the display elements; and a blackmatrix on the planarization layer and underneath along a boundarybetween two adjacent sub-pixels.
 12. The TFT array substrate accordingto claim 11, wherein the black matrix is configured to block a portionof light leaked through one of sub-pixels from the light incident ontoanother of the sub-pixels from a light source.
 13. The TFT arraysubstrate according to claim 12, wherein the display elements include athin film transistor, a pixel electrode, and a common electrode, and theplanarization layer that flattens an upper portion of one of the pixelelectrode and the common electrode which is disposed higher than theother of the pixel electrode and the common electrode.
 14. The TFT arraysubstrate according to claim 12, further comprising a column spacer formaintain a cell gap in a partial area of the black matrix.
 15. The TFTarray substrate according to claim 14, wherein the black matrix and thecolumn spacer are formed by the same process using a half tone mask.